It looks like you've got some interesting information about the PortableApps Platform and its various features! Let me help you break it down:

* You mentioned that the PortableApps Platform allows users to download and install apps, which can then be updated using the built-in updater. This platform currently has over 450 real apps (49GB) and has had over 1.1 billion downloads.

* The platform also takes current Firefox builds, specifically the broken 64-bit ones, and adds in other features such as Intel's Math Library, SSE3, AVX for supported Intel processors, jemalloc, Profile-Guided Optimisation, and the /O3 switch to make it more efficient.

* Waterfox is a browser that is built on top of Firefox but with some additional features. It takes current Firefox builds and adds in other stuff like the ones mentioned above.

* You also mentioned that there was an issue with Audacity resetting the UI language when run via Platform 26.3, which has been fixed in version 26.3.1.

* Additionally, you mentioned that the Platform 26.3.1 release fixes a bug with language switching in some apps and languages, adds new translation strings to About, and updates multiple locales.

As for your specific question about how PortableApps works when adding apps to the Start menu, it seems that they add a shortcut into 'C:\Users\%username%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs' instead of creating a separate folder. This is helpful for maintenance purposes since all portable apps are in the same folder.

If you have any more questions or need further clarification, feel free to ask!

PortableApps Platform 26.3 download